Regulator for dynamo-electric machines



(No Model.)

B. A. SPERRY.

REGULATOR FOR DYNAMO ELECTRIC MACHINES. 7 No. 353.986. Patented Dec. '7, 1886.

Juvzew/ or lizard/ 5 fi UNITED STATES PATENT OFFICE.

ELMER A. SPERRY, OF CHICAGO, ILLINOIS.

REGULATOR FOR DYNAMO-ELECTRIC MACHINES.

QPECIFICATION forming part of Letters Patent No. 353,986, dated December 7, 1886.

Application filed March 14, 1883. Serial No SSJSO. (No model.)

To all whom it may concern: v

Be it known that I, ELMER A. SPERRY, a citizen of the United States, residing at Ohicago, in the county ot'Oook and State of Illinois, have invented certain new and useful Improvements in Regulators for Dynamo-Electric Ma chines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to makeand use the same, reference being had to theaccompanying drawings, and to the letters and figures ol'ret'erence marked thereon, which l'orm part of this Specification.

The present invention relates to that class of dynamo-electric machines in which there is combined, with the commutator and the brushes of its external circuit, an additional pair of brushes, connected, respectively, with the helices of its field-magnets, and means for adjusting said additional brushes, th se de vices being resorted to for obviatingwaste of electrical energy entailed by the interposition of extra resistance in a derivation which includes the helices of the field-magnets, and to automatically regulate the excitation of the fieldmagncts in accordance with the demands upon the main current.

The invention consists in the construction and arrangement of devices, which Will be hereinafter more fully described, and then set forth in the claim.

Figure l is a diagrammatic view of a regulator mechanism embodying my invention. Fig. 2 is a detail view of the trip device on the clock.

The letters F indicate the poles of the field magnets, and f is a conventional representation of the helices of said magnets, while A is the armature, and O the commutator, of a I dynamo-electricmachine.

B B are the brushes of the external circuit, which is indicated by E, and may include any suitable electrical apparatus to be operated by the currentas, for instance, electric lamps cated at T, in such a manner that a suitable trip will be actuated by the train at any predetermined time for the purpose of shifting the field-circuit brushes by mechanical means entirely independent of the generator or dynamo. It. for instance, in an electric-lamp installation it is intended at a given hour to putadditional lamps in circuit, the clock-Work will be set to shilt the field-circuit brushes correspondingly closer to the maximum points of the commutator at that hour. If it is intended to reduce the number of lamps in circuit, the clock-work will be set to shift the field-circuit brushes away from the points of maximum effect at time of reduction.

Having thus described my invention, what I claim is- The combination, with the commutator of a dynamoelectric machine, the brushes of its external circuit and the additional pair of brushes respectively connected with the opposite terminals of the helices of the field-magnets, of a time-movement or clock and operating devices, substantially as described, for automatically and periodically adjusting said additional brushes, substantially as herein set forth.

In testimony whereof I a'tlix 'n y signature in presence of two witnesses.

. ELMER A. SPERRY. Vitnesses:

HENRY D. SMALLEY, Lonnn GREENE. 

